mineral

Rough quartz crystal, possibly milky quartz

Quartz, SiO₂; exact variety uncertain from the image

AI-generated identification · may be incorrect

White to translucent, vitreous-to-pearly luster, and irregular crystalline surfaces; quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage, breaking with conchoidal fracture. The brown streak-like area may be an iron-oxide stain or an inclusion.

Streak: like area may be an iron-oxide stain or an inclusion

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids in veins, cavities, and igneous or metamorphic rocks; its age depends on the host deposit and cannot be determined from appearance alone.

Uses & applications

Commonly collected as a natural specimen; quartz is also used in glass, electronics, abrasives, and occasionally jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and occurs in many colors and crystal habits.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide in veins and pegmatites. Image identification is tentative because the specimen is small and partly obscured.